com.streambase.liveview.client

Class AbstractBatchedQueryListener

java.lang.Object

com.streambase.liveview.client.AbstractQueryListener

com.streambase.liveview.client.AbstractBatchedQueryListener

All Implemented Interfaces:

QueryListener, EventListener

public abstract class AbstractBatchedQueryListener
extends AbstractQueryListener

An abstract implementation of a QueryListener that batches up multiple events and sends them to the concrete implementation.

Concrete implementations must implement the abstract AbstractBatchedQueryListener.snapshot(List, boolean) and AbstractBatchedQueryListener.update(List) methods to receive batched up events.

Constructor Summary

Constructors

Constructor and Description
AbstractBatchedQueryListener() Constructs a listener with quarter-second interval and the maximum batch size.
AbstractBatchedQueryListener(long interval, TimeUnit unit, boolean collapseEvents) Constructor to set an interval for receiving batched results.
AbstractBatchedQueryListener(long interval, TimeUnit unit, boolean collapseEvents, int maxBatchSize) Constructor to set an interval for receiving batched results.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the thread that calls the batch methods periodically
void	exceptionRaised(QueryExceptionEvent event) Event when an exception occurs during the query.
void	finalize()
void	queryClosed(QueryClosedEvent event) Event when a query being listened to is closed.
abstract void	snapshot(List<TupleAddedEvent> eventList, boolean complete) This batch method is called one or more times for snapshot results.
void	snapshotBegin(BeginSnapshotEvent event) Event to indicate the start of the result snapshot.
void	snapshotEnd(EndSnapshotEvent event) Event to indicate the query snapshot is complete.
void	tupleAdded(TupleAddedEvent event) Event when a new tuple is added to the result.
void	tupleRemoved(TupleRemovedEvent event) Event when an existing tuple is removed from the result.
void	tupleUpdated(TupleUpdatedEvent event) Event when an existing tuple in the result is updated.
abstract void	update(List<AbstractTupleEvent> eventList) This batch method is called zero or more times for continuous updates.

Methods inherited from class com.streambase.liveview.client.AbstractQueryListener

deleteBegin, deleteEnd

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.streambase.liveview.client.QueryListener

aggMarkBegin, aggMarkEnd

Constructor Detail

AbstractBatchedQueryListener

public AbstractBatchedQueryListener()

Constructs a listener with quarter-second interval and the maximum batch size.

AbstractBatchedQueryListener

public AbstractBatchedQueryListener(long interval,
                                    TimeUnit unit,
                                    boolean collapseEvents)

Constructor to set an interval for receiving batched results.

Parameters:

interval - notification interval

unit - notification interval unit

collapseEvents - whether or not to collapsed multiple updates in the same batch

AbstractBatchedQueryListener

public AbstractBatchedQueryListener(long interval,
                                    TimeUnit unit,
                                    boolean collapseEvents,
                                    int maxBatchSize)

Constructor to set an interval for receiving batched results.

Parameters:

interval - notification interval

unit - notification interval unit

collapseEvents - whether or not to collapsed multiple updates in the same batch

maxBatchSize - max batch size before notification

Method Detail

snapshot

public abstract void snapshot(List<TupleAddedEvent> eventList,
                              boolean complete)

This batch method is called one or more times for snapshot results.

Parameters:

eventList - the added tuples

complete - indicator whether the snapshot is complete or not

update

public abstract void update(List<AbstractTupleEvent> eventList)

This batch method is called zero or more times for continuous updates.

Parameters:

eventList - the continuous tuple events

tupleRemoved

public void tupleRemoved(TupleRemovedEvent event)

Event when an existing tuple is removed from the result.

This method may be extended, ensuring a super call is made.

Specified by:

tupleRemoved in interface QueryListener

Overrides:

tupleRemoved in class AbstractQueryListener

Parameters:

event - remove event

tupleAdded

public void tupleAdded(TupleAddedEvent event)

Event when a new tuple is added to the result.

This method may be extended, ensuring a super call is made.

Specified by:

tupleAdded in interface QueryListener

Overrides:

tupleAdded in class AbstractQueryListener

Parameters:

event - add event

tupleUpdated

public void tupleUpdated(TupleUpdatedEvent event)

Event when an existing tuple in the result is updated.

This method may be extended, ensuring a super call is made.

Specified by:

tupleUpdated in interface QueryListener

Overrides:

tupleUpdated in class AbstractQueryListener

Parameters:

event - update event

snapshotBegin

public void snapshotBegin(BeginSnapshotEvent event)

Event to indicate the start of the result snapshot. This is the first method called when a query starts returning results, but this method is also called to indicate a reset (a complete restart of the query.)

This method may be extended, ensuring a super call is made.

Specified by:

snapshotBegin in interface QueryListener

Overrides:

snapshotBegin in class AbstractQueryListener

Parameters:

event - snapshot begin

snapshotEnd

public void snapshotEnd(EndSnapshotEvent event)

Event to indicate the query snapshot is complete.

This method may be extended, ensuring a super call is made.

Specified by:

snapshotEnd in interface QueryListener

Overrides:

snapshotEnd in class AbstractQueryListener

Parameters:

event - snapshot end

exceptionRaised

public void exceptionRaised(QueryExceptionEvent event)

Event when an exception occurs during the query. Since 1.3, reaching the row limit is considered an exception.

This method may be extended, ensuring a super call is made.

Specified by:

exceptionRaised in interface QueryListener

Overrides:

exceptionRaised in class AbstractQueryListener

Parameters:

event - exception event

queryClosed

public void queryClosed(QueryClosedEvent event)

Event when a query being listened to is closed.

This method may be extended, ensuring a super call is made.

Specified by:

queryClosed in interface QueryListener

Overrides:

queryClosed in class AbstractQueryListener

Parameters:

event - query closed event

close

public void close()

Closes the thread that calls the batch methods periodically

finalize

public void finalize()

Overrides:

finalize in class Object